Work-holder for sharpening blades.



R. S. GREEN.

WORK HOLDER FOR SHARPENING BLADES.

APPLICATION FILED APR.12. I915.

Patented Oct. 3, 1916.

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'rA'rEs PA RAPHAEL GREEN. CHICAGO, ILLINOIS.

WORK-HOLDER non sHARPENINe; BLADES.

To all whom it may concern Be it known that I, RAPHAEL S. GREEN,

a citizen of the United States, residing at Chicago, inthe county of Cook and. State of Illinois, have invented certain new and this specification, in which corresponding numerals of reference, in the different figures indicate like parts.-

My invention relates to work-holders adapted for use with machines for sharpening razor-blades and similar articles, which machines are so constructed as to actuate a work-holder to alternately present opposite sides of the blade to be sharpened to opposed grinding or honing surfaces and at the same time cause said holders to be moved laterally until the The object of my invention is to over come this difiiculty by constructing a holder which may be so adjusted independently of its fellows, asto enable it to be. used upon the same machine with othersand with like accuracy as to results, all of which is hereinafter more particularly described and definitely pointed out in the claims In the drawings: Figure 1,'is a plan view of a machine showing a plurality of work-holders mounted thereon, Fig. '2, is a section taken upon the line 22, Fig. 1, viewed in the direction of thelarrow there shown, Fig. 3, is a side elevation of a workholder embodying the features of my invention, a portion of the same being shown in vertical longitudinal section, said holder being shown as it would appear when mounted upon the feed-screw and eccentric shaft, Fig. 4, is a plan view in detail ofa portion of a work-holder showing means for axial adjustment, and Fig. 5, is a sectional view taken upon the line 55, Fig. 4.

' Specification of Letters Patent.

Patented Oct. 3, 1916.

Application filed April 12, 1915. Serial No. 20,763.

Referring to the drawings, 1, indicates the frame of a grinding machine having opposing rollers 2, 3, arranged to be rotated in opposite directions by means of pulleys 4, 5, connected with a suitable source of power. Located in a plane midway between the faces of the sharpening rollers and parallel therewith, is a feedscrew 6, which is journaled in the frame and provided with a driving pulley 7, upon one of its ends. Journaled in the frame, in the plane of the feed-screw 6, that is, midway between the opposing faces of the sharpeningrollers 2 and 3, is an eccentric shaft 8, aving an eccentric portion 9, formed thereon between said bearings and corresponding substantially in length to thatof the sharpening rollers. Said shaft is provided with a driving pulley 10.

A work-holder, generally designated by 11, is provided with a main body portion 12, tov which is jointedly connected at 13, a hinged: member 14, intended to be detachably connected therewith by means of a locking member, the body 15, of which is journaled in a bore in the part 12 and provided with a locking finger 16, arranged to engage the free end of the part 14 andhold it in place. The part is adapted to be operated by means of a thumb-nut 17. A bore having an internal screw-thread, is

7 formed in the two parts 12, and 14, being equally divided between them for the reception of the feed-screw 6. The parts 12,

and 14, are cut away as shown at 18, and 19, respectively, to form an elongated opening between them for the reception of the eccentric shaft 9'. A. sheet-metal plate or tongue 20, preferably of spring steel, has its forward end rigidly secured in the part 12, as shown at 21, while a like tongue 22, is secured in the same manner in a suitable notch formed at 23 in the member 14. Said springs tend to separate from each other so as to bear normallyagainst theinner faces of the parts 12 and 14. Opposing adjusting screws 24, and 25, are tapped into the engage the free ends of said springs, which later serve as bearing faces for the eccen-.

area.

parts 12, and 14, respectively in position to 28, is loosely mounted upon said stem and is held in place by means of a pin 29, better shown in Figs, 4 and 5, which is passed through a bore in said stem. Elongated slots 80, 30, are formed in said sleeve to provide for a limited play or oscillation of'the sleeve.

A flat spring shank 31,.is rigidly attached to the head of the sleeve toawhich, in turn, is

secured flat spring clamping members 32,

lease the part 1a, which enables the holder to be placed in an operative position upon ,the feed-screw 6 and eccentric shaft 9, as

shown in Figs. 1 andiZ. The rear end of the holder is caused to vibrate up and down by the rotation of the eccentric shaftthereby alternately bringing the article to be sharpened into contact with the opposed sharpening rollers which are driven in opposite directions. If the threaded bore in the holder which engages the feeding shaft is out of true, the rotation of the sleeve 28,

upon the stem 26, will permit the blade as it is pressed against the sharpening surfaces, to assume true parallelism therewlth and thus sharpen the article evenly from end to end, In order, however, to insure uniform pressure against the opposing rollers, it is essential that the vibratory action of the eccentric shaft should cause the throw of the tool to be uniform with respect to the plane between the opposing forces of the rollers. This may be accomplished with the utmost accuracy by means of the spring plates 20. and 22 and the adjusting nuts 24 and 25. Should, for example, a blade when ground indicate an excessive pressure again-st the lower roll, an outward turn of the screw 24:, and a corresponding inward turn of the screw 25, would tend to correct the difficulty. When all of the holders are adjusted for a given machine, they will need no further attention as .an adjustment of a given set of holders may be made once for all except to take up wear upon the eccentric shaft and-adjusting plates, which, with ordinary care, would be inappreciable. 'My

improvement enables any predetermined number of work-holders to be. accurately adjusted to a given machine,

Having thus described my invention, I claim: s

1. A work-holder of the class described,

comprising, in combination, a body portion having an internally threaded transverse consisting of jointedly connected, separable elements, having an internally threaded transverse bore and an elongated opening therein, acounterpart portion of each of which is formed in said separable elements to provide for its connection with and removal from a feed-screw and eccentric shaft in a machine for utilizing the same, adjustable members located in each of said counterpart members to form opposing bearing members for a rotary eccentric shaft, means for adjusting said bearing members in different planes parallel with the longitudinal axis of said holder and a work-holding clamp mounted upon the end of said holder,

3. The combination with a vibratory workholder of the class described, to be vibrated upon a transverse pivotal axis, of a workholding clamp upon one end thereof and adjustable bearing members mounted in the body of said holder, said members having bearing surfaces arranged upon opposite sides of and parallel to the longitudinal axis of said holder, and means for moving said members to or from said longitudinal axis while maintaining substantial parallelism therewith. s

- 4. The combination with a vibratory workholder of the class described to be vibrated upon a transverse pivotal axis, of a workholding clamp upon one end thereof mounted to have axial movement thereon upon the longitudinal axis of said holder, and adustable bearlng members mounted in the RAPHAEL S. GREEN.

Witnesses:

DAVID H. FLETCHER, JENNIE L. FIsKE.

Copies of this patent may be obtained for live cents each, by addressing the Commissioner of Patents.

Washington, D. G." 

